TWI433546B - Image resolution adjusting devices, display devices and image resolution adjusting methods - Google Patents

Description

Image resolution adjustment device, display device, and image resolution adjustment method

The invention relates to an image processing technology, in particular to an image resolution adjusting device and method.

In today's display devices, electronic screen systems are widely used in a variety of products, such as digital cameras, liquid crystal displays (LCDs), and LCD televisions. In order to cooperate with an electronic screen system having various resolutions, image scaling control must be performed for the resolution of the image source. For example, if the input image resolution is VGA mode (640x480) and the output demand is XGA mode (1024x768), the image resolution should be improved. If the input image resolution is SXGA mode (1280x1024), the output requirement is XGA mode ( 1024x768), the image resolution needs to be reduced to meet the specifications of the system application.

Traditional image scaling control techniques typically use interpolation or replication. The use of interpolation to magnify images has the advantage of smoothing the edges of the image, however, it changes the original image content, resulting in a reduction in the true accuracy of the image. If the copying method is not properly controlled, the edge of the display screen will be jagged, which will affect the quality of the screen. US Patent No. US7199837 (Callway) discloses a method and system for image scale-up. However, in the above conventional technique, after the image is amplified by a replicator, the image resolution must be adjusted again via a re-sampler. , reducing the efficiency of image scaling.

In view of the above, the present invention provides an image resolution adjusting apparatus, which is adapted to adjust an original resolution of a source image according to a display resolution of a display device, including an image cutting device, according to the display resolution and the original resolution. Separating the source image into a plurality of image blocks; a zoom control device determining, according to the position of the image block, a scaling ratio corresponding to each of the image blocks; and an image scaling device according to Adjusting the resolution of the image block by the zoom ratio corresponding to each of the image blocks, and outputting the image block after adjusting the resolution to the display device.

In addition, the present invention provides a display device including a display panel having a display resolution for displaying an output image, and an image resolution adjusting device for receiving a source image having an original resolution, according to the above Displaying the resolution and the original resolution, separating the source image into a plurality of image blocks, and determining, according to the position of the image block, a scaling ratio corresponding to each of the image blocks, and according to the image The scaling of the image block is adjusted by the scaling corresponding to the block to generate the output image.

In addition, the present invention provides a method for adjusting the image resolution, which is suitable for adjusting the original resolution of a source image according to the display resolution of one of the display devices, including separating the source image according to the display resolution and the original resolution. a plurality of image blocks; determining, according to the position of the image block, a scaling ratio corresponding to the image block; and determining, according to the image block, the scaling ratio corresponding to the image block For example, the resolution of the image block is adjusted, and the image block after the resolution is adjusted is displayed on the display device.

The above described objects, features, and advantages of the invention will be apparent from the description of the preferred embodiments illustrated herein The architectural diagram of the display device described in the embodiment. A display device according to an embodiment of the invention includes a display panel 10 and a image resolution adjusting device 12. The display panel 10 has a predetermined display resolution for displaying an output image using the predetermined display resolution. The image resolution adjusting device 12 receives the source image 14 having an original resolution, and adjusts the resolution of the source image 14 according to the predetermined display resolution of the display panel 10. According to an embodiment of the invention, the original resolution and the predetermined display resolution may be (1024*768)→(2560*2048), (640*350)→(1024*768), (640*350)→(1600, respectively. *1200) and (640*400)→(2048*1536). However, the conversion of the original resolution of the VESA display standard to the resolution of the display is only a specific embodiment. In fact, the display device according to the embodiment of the present invention can perform the original resolution and the predetermined display resolution according to actual needs. Any resolution conversion.

FIG. 2 is a block diagram showing the image resolution adjusting apparatus 12 according to an embodiment of the present invention. Image solution according to an embodiment of the invention The resolution adjusting device 12 includes an image cutting device 22, a zoom control device 24, and an image zooming device 26. The image cutting device 22 receives the source image 14 and separates the source image 14 into a plurality of image blocks according to the display resolution of the display panel 10 and the original resolution of the source image 14. The zoom control device 24 determines the corresponding zoom ratio according to the position of the cut image block at the source image. The image scaling device 26 adjusts the resolution according to the scaling ratio corresponding to each image block, and outputs the image block with the adjusted resolution to the display device 10.

According to an embodiment of the invention, the size of the image block and the manner of cutting are determined according to the display resolution of the display panel 10 and the original resolution of the source image 14. Figure 3 is a diagram showing the relationship between a source image and an output image according to an embodiment of the invention. Here, the output image 34 is larger than the source image 32 as an example. As shown, the source image 32 can be cut into image blocks A, B1-B4, C1-C2, and D1-D2. According to the positions of the image blocks A, B1-B4, C1-C2 and D1-D2 in the source image 32, there are corresponding enlargement ratios. For example, the image block A has an enlargement ratio of 3 times in the X-axis direction and a magnification ratio of 3 times in the Y-axis direction. The magnification ratios of the image blocks B1-B4 in the X-axis direction and the Y-axis direction are both doubled. The image block C1-C2 has an enlargement ratio of 3 times in the X-axis direction and a magnification ratio of 1 in the Y-axis direction. The image block D1-D2 has an enlargement ratio of 1 in the X-axis direction and a magnification ratio of 3 in the Y-axis direction. As a matter of fact, the image block can have different scaling ratios in the X-axis direction and the Y-axis direction. Furthermore, as can be seen from FIG. 3, the image block corresponds to the center point S of the source image 32 and has a symmetrical scaling. For example, image blocks C1 and C2, image block B1 And B3 and image blocks B2 and B4 have a line symmetry relationship through the line XX' of the center point S, and the image blocks B1 and B2, the image blocks B3 and B4, and the image blocks D1 and D2 It is a line symmetry line passing through the line YY' of the center point S, and has a line symmetry relationship. Similarly, the image blocks B1 and B4 have a point-symmetric relationship with respect to the center point S. Moreover, the image block is sequentially decremented according to the position of the source image 32, and the magnification ratio corresponding to an intermediate region to an edge region is sequentially decreased. For example, taking the image blocks C1 and B1 as an example and placing the x-axis direction, the image block C1 is located at a position close to the intermediate portion of the source image 32, and the magnification ratio is three times, and the image block B1 is located near the source image 32. The position of the edge area is doubled.

In addition, according to another embodiment of the present invention, for a certain resolution, the image block may be scaled up to adjust the display resolution, since the scale of the image is at least 2 times or more than the integer, if still When the resolution is smaller than the display resolution, the resolution part that cannot be complemented can be filled in a black box to facilitate the complete display resolution part.

FIG. 4 is a flow chart showing the operation of determining the cutting mode and the enlargement ratio of the image block of the source image according to an embodiment of the invention. The present invention determines which resolution mode to adjust the resolution of the image block based on the display resolution of the display panel 10 and the original resolution of the source image 14. In addition, the embodiment of the present invention independently compares the number of pixels of the display panel 10 and the source image 14 at the same coordinate. For example, how to determine the Y-axis direction of the source image 14 based on the display resolution VO of the display panel 10 in the Y-axis direction and the original resolution VI of the source image 14 in the Y-axis direction. Cut the image block. The following description only discusses the judgment mechanism of a single axis (for example, the Y axis), and the judgment mechanism of another coordinate axis (for example, the X axis) is equally applicable, and will not be described here to simplify the description. In addition, the following discussion discusses the increase of the resolution. In the embodiment, as for the embodiment of reducing the resolution, the same concept can be applied in the same way.

First, it is determined whether the difference between the display resolution VO of the display panel 10 and the original resolution VI of the source image 14 is less than or equal to twice the original resolution VI (S1), when the display resolution VO of the display panel 10 and the source image 14 are When the difference between the original resolution VIs is less than or equal to twice the original resolution VI, it is determined whether the display resolution VO is an integer multiple of the original resolution VI (S2). If it is an integer multiple, it is determined in step S8 whether smooth fine adjustment needs to be performed. The mechanism performs the corresponding processing, and then the judgment flow is ended, and the source image 14 is directly enlarged according to the relationship between the display resolution VO and the original resolution VI. If the display resolution VO is not an integer multiple of the original resolution VI, the cutting mode and the enlargement ratio of the image block of the source image are determined in the first zoom mode (S3). The first zoom mode For the image block of the source image, please refer to equations (1) and (2): (VO-VI)/2=VC (1) (3VI-VO)/4=VS (2)

Among them, the parameters VC and VS are shown in Figure 5.

In addition, step S8 analyzes whether it is necessary to perform a smoothy scaling modify module. Here, perform a smooth fine-tuning machine The basis for the judgment can be based on whether the VS needs to be revised or based on actual needs. For example, when VS is not an integer, VS can be corrected by a smooth fine-tuning mechanism (S9). According to an embodiment of the present invention, (VS-0.5) can be set to Up_VS, (VS+0.5) can be set to Down_VS, and parameters Up_VS and Down_VS are indicated in FIG. Through the smooth fine-tuning mechanism, the image can be smoothed and fine-tuned after the image is enlarged to facilitate the visual effect.

According to the first zoom mode, the Y-axis direction of the image block located in the area indicated by the parameter VC is magnified by three times, and the Y-axis direction of the image block located in the area indicated by the parameter VS, Up_VS or Down_VS is doubled. . Taking FIG. 5 as an example, after the source image 32 is enlarged, the resolution of the area indicated by the original parameter VC is changed from 640 to 1920, and the resolution of the area indicated by the parameter VS is maintained at 64. Next, after the first zoom mode determines the cutting mode of the image block and the corresponding zoom ratio, the determination process is ended, and the source image 14 is enlarged according to the relationship defined by the first zoom mode.

In step S1, if the difference between the display resolution VO of the display panel 10 and the original resolution VI of the source image 14 is greater than twice the original resolution VI, it is determined whether the display resolution VO is an integer multiple of the original resolution VI ( S4), if it is an integer multiple, it is determined in step S8 whether it is necessary to perform a smooth fine-tuning mechanism to perform the corresponding processing, and then the determination process is ended, and the source image 14 is directly enlarged according to the relationship between the display resolution VO and the original resolution VI. . If it is not an integer multiple, it is judged whether the seven times original resolution VI is greater than twice the display resolution VO (S5). If the seven times original resolution VI is greater than twice the display resolution VO, the source image is determined in the second zoom mode. The cutting mode of the image block and the magnification ratio (S6). The second zoom mode refers to equations (3), (4), and (5) for the image block of the source image. (VO-3VI)/2=VS (3) x+y=VI-2VS=VC (4) 2x+zy=VO-2VS where z≧3 and x and y>0 (5)

Among them, the parameters VC, VS, y are indicated in Figure 7, and the parameters x1 + x2 = x.

According to the second zoom mode, the Y-axis direction of the image block located in the area indicated by the parameter y is enlarged by seven times, and the Y-axis direction of the image block located in the area indicated by the parameter VS is doubled, and is located at the parameter x1. The Y-axis direction of the image block of the area marked by x2 is doubled. Taking Fig. 7 as an example, when the parameter z is selected to be 7, after the source image 32 is enlarged, the resolution of the region indicated by the original parameter y is changed from 130 to 910, and the resolution of the region indicated by the parameters x1 and x2 is changed from 35 to 70. The area indicated by the parameter VS is maintained at 75. Next, after determining the cutting mode of the image block and the corresponding enlargement ratio through the second zoom mode, it is determined in step S8 whether the smooth fine adjustment mechanism needs to be executed to perform the corresponding processing, and then the determination process is ended, according to the second The source image 14 is enlarged by the relationship defined by the zoom mode.

In step S5, if the seven times the original resolution VI is less than twice the display solution For the resolution VO, the cutting mode and the magnification ratio of the image block of the source image are determined in the third zoom mode (S7). The third zoom mode For the image block of the source image, please refer to equations (6), (7) and (8): VI/4=VS (6) x+y=VI-2VS=VC (7) 2x+zy=VO-VI where z≧3 and x and y>0 (8)

Among them, the parameters VC, VS, y are indicated in Figure 8, and the parameters x1 + x2 = x.

According to the third zoom mode, the Y-axis direction of the image block located in the area indicated by the parameter y is enlarged by a factor of six, and the Y-axis direction of the image block located in the area indicated by the parameter VS is doubled, and is located at the parameter x1. The Y-axis direction of the image block of the area marked by x2 is doubled. Taking Fig. 8 as an example, when the selection parameter z is 6, after the source image 32 is enlarged, the resolution of the region indicated by the original parameter y is changed from 184 to 1104, and the resolution of the region indicated by the parameters x1 and x2 is changed from 8 to 16. And the resolution of the area indicated by the parameter VS is changed from 100 to 200. Next, after the third zoom mode determines the cutting mode of the image block and the corresponding zoom ratio, it is analyzed by step S8 whether the smooth fine tuning mechanism needs to be executed. For example, when VS is not an integer, VS can be corrected by a smooth fine-tuning mechanism (S9). According to an embodiment of the invention, (VS-0.5) can be set to Up_VS, which will be (VS+0.5) Set to Down_VS. This determination process can then be ended, and the source image 14 is enlarged according to the relationship defined by the third zoom mode.

In summary, according to the image resolution adjustment method disclosed in the embodiment of the present invention, the resolution of the source image can be directly adjusted according to the display resolution of the display panel and the original resolution of the source image, and the symmetry of the human eye is considered. Gradually reduce the magnification of the resolution from the center to the edge of the source image to increase the smoothness of the image edges. In addition, since the image resolution adjustment method disclosed in the embodiment of the present invention does not modify the original data, the original image data can be retained, and the original image is improved in authenticity, and at the same time conforms to the high-resolution display image. Therefore, it is suitable for the function of softening and hardening of images and maintaining high original authenticity.

The present invention has been described above with reference to the preferred embodiments thereof, and is not intended to limit the scope of the present invention, and the invention may be modified and modified without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.

10‧‧‧ display panel

12‧‧‧Image resolution adjustment device

14‧‧‧Source image

22‧‧‧Image cutting device

24‧‧‧Zoom control unit

26‧‧‧Image zooming device

A, B1-B4, C1-C2, D1-D2‧‧‧ image blocks

XX’, YY’‧‧ symmetry line

S‧‧‧ Center Point

VI‧‧‧ original resolution

VO‧‧‧ display resolution

VC, VS, Up_VS, Down_VS, x, x1, x2, y, z‧‧‧ parameters

1 is a block diagram showing a display device according to an embodiment of the invention.

FIG. 2 is a block diagram showing the image resolution adjusting apparatus 12 according to an embodiment of the present invention.

Figure 3 is a diagram showing the relationship between a source image and an output image according to an embodiment of the invention.

FIG. 4 is a flow chart showing the operation of determining the cutting mode and the enlargement ratio of the image block of the source image according to an embodiment of the invention.

FIG. 5 is a schematic diagram showing a cutting mode and an enlargement ratio of an image block of a source image in a first zoom mode according to an embodiment of the invention.

FIG. 6 is a schematic diagram showing a cutting mode and an enlargement ratio of an image block of a source image determined by a first zoom mode according to another embodiment of the present invention.

FIG. 7 is a schematic diagram showing a cutting mode and an enlargement ratio of an image block of a source image in a second zoom mode according to an embodiment of the invention.

FIG. 8 is a schematic diagram showing a cutting mode and an enlargement ratio of an image block of a source image in a third zoom mode according to an embodiment of the invention.

10‧‧‧ display panel

12‧‧‧Image resolution adjustment device

14‧‧‧Source image

22‧‧‧Image cutting device

24‧‧‧Zoom control unit

26‧‧‧Image zooming device

Claims (36)

An image resolution adjusting apparatus is adapted to adjust an original resolution of a source image according to a display resolution of a display device, wherein the display resolution is greater than the original resolution, and includes: an image cutting device, which is configured according to the display And the original resolution, the source image is divided into a plurality of image blocks; and a zoom control device determines, according to the position of the image block, a scale corresponding to each of the image blocks, The scaling ratio corresponding to an intermediate region to an edge region is sequentially decreasing; and an image scaling device adjusts the resolution of the image block according to the scaling ratio corresponding to the image block respectively, and outputs an adjustment resolution The image block is then transferred to the display device. The image resolution adjusting device of claim 1, wherein the source image has a first number of pixels in a first dimension and a second number of pixels in a second dimension, and the image region The scaling ratio of the block in the first dimension direction and the second dimension direction is different. The image resolution adjusting device according to claim 1, wherein the image block has different resolutions in the source image. The image resolution adjusting apparatus according to claim 1, wherein the image block corresponds to a center position of the source image, and has the above-mentioned scaling ratio of symmetry. Image resolution adjustment device as described in item 1 of the patent application scope The image block is located at an edge region of the source image, and one of the image blocks corresponds to a magnification ratio of one. The image resolution adjusting device according to claim 1, wherein the zoom control device further determines the first image according to a position of the image block at the source image and a relationship between the display resolution and the original resolution. The zoom mode, a second zoom mode, or a third zoom mode determines the scaling of each of the image blocks. The image resolution adjusting apparatus according to claim 6, wherein the difference between the display resolution and the original resolution is less than or equal to 2 times the original resolution, and the display resolution and the original resolution are When the ratio is a non-integer ratio, the scaling control means determines the scaling ratio of each of the image blocks according to the first scaling mode. The image resolution adjusting device according to claim 7, wherein the image size corresponding to the image block located in the middle region is three times, and the image block located in the edge region corresponds to the image block. The magnification ratio is 1 time. The image resolution adjustment device according to claim 6, wherein the ratio of the original resolution, the display resolution, and the original resolution is greater than a difference between the display resolution and the original resolution When the non-integer ratio is seven times the original resolution of the display resolution greater than two times, the scaling control means determines the scaling ratio of each of the image blocks based on the second scaling mode. The image resolution adjusting device according to claim 9, wherein the image block is from the intermediate region to the edge region Corresponding to the above-mentioned enlargement ratios are sequentially a predetermined multiple, 2 times and 1 time, and the above-mentioned predetermined multiple is greater than or equal to 3 times. The image resolution adjustment device according to claim 6, wherein the ratio of the original resolution, the display resolution, and the original resolution is greater than a difference between the display resolution and the original resolution When the non-integer ratio is seven times the original resolution of the display resolution of not more than two times, the scaling control means determines the scaling ratio of each of the image blocks based on the third scaling mode. The image resolution adjusting device according to claim 11, wherein the magnification ratio corresponding to the image region from the intermediate region to the edge region is sequentially a predetermined multiple and twice, and the predetermined multiple is greater than Or equal to 3 times. A display device includes: a display panel having a display resolution for displaying an output image, wherein the display resolution is greater than an original resolution; and an image resolution adjusting device for receiving the original resolution The source image is one of the image regions, and the source image is divided into a plurality of image blocks according to the display resolution and the original resolution, and each of the image blocks is determined according to the position of the image block at the source image. a scaling ratio, wherein the scaling ratio corresponding to an intermediate region to an edge region is sequentially decreased, and the resolution of the image block is adjusted according to the scaling ratio corresponding to the image block to generate the output image. The display device of claim 13, wherein the upper display device The source image has a first number of pixels in a first dimension and a second number of pixels in a second dimension, and the scaling of the image block in the first dimension and the second dimension different. The display device of claim 13, wherein the image block has a different resolution in the source image. The display device of claim 13, wherein the image block corresponds to a center position of the source image, and has the above-mentioned scaling ratio of symmetry. The display device of claim 13, wherein when the image block is located at an edge region of the source image, one of the image blocks corresponds to an enlargement ratio. The display device of claim 13, wherein the zoom control device is further configured according to a position of the image block at the source image and a relationship between the display resolution and the original resolution according to a first zoom mode, A second zoom mode or a third zoom mode determines the scaling of each of the image blocks. The display device according to claim 18, wherein the difference between the display resolution and the original resolution is less than or equal to 2 times the original resolution, and the ratio of the display resolution to the original resolution is The non-integer ratio, the scaling control means determines the scaling ratio of each of the image blocks according to the first scaling mode. The display device of claim 19, wherein the image size of the image block located in the intermediate region corresponds to an enlargement ratio of three times, and the image block located in the edge region corresponds to the image block The magnification ratio is 1 time. The display device according to claim 18, wherein the ratio of the original resolution, the display resolution, and the original resolution is a non-integer ratio when the difference between the display resolution and the original resolution is greater than 2 times And when the original resolution of seven times the display resolution is greater than two times, the scaling control device determines the scaling ratio of each of the image blocks according to the second scaling mode. The display device according to claim 21, wherein the magnification ratio corresponding to the image region from the intermediate region to the edge region is sequentially a predetermined multiple, 2 times, and 1 time, and the predetermined multiple is greater than Or equal to 3 times. The display device according to claim 18, wherein the ratio of the original resolution, the display resolution, and the original resolution is a non-integer ratio when the difference between the display resolution and the original resolution is greater than 2 times And if the original resolution of the seven times is less than twice the display resolution, the scaling control device determines the scaling ratio of each of the image blocks according to the third scaling mode. The display device according to claim 23, wherein the magnification ratio corresponding to the image region from the intermediate region to the edge region is sequentially a predetermined multiple and twice, and the predetermined multiple is greater than or equal to 3 Times. An image resolution adjustment method is adapted to adjust an original resolution of a source image according to a display resolution of a display device, wherein the display resolution is greater than the original resolution, including: Determining, according to the display resolution and the original resolution, the source image as a plurality of image blocks; determining, according to the position of the source image, a scaling ratio corresponding to each of the image blocks, The scaling ratio corresponding to the intermediate region to the edge region is sequentially decreased; and the resolution of the image block is adjusted according to the scaling ratio corresponding to the image block respectively, and the image block after the resolution is adjusted Displayed on the above display device. The image resolution adjustment method of claim 25, wherein the source image has a first number of pixels in a first dimension and a second number of pixels in a second dimension, and the image area The scaling ratio of the block in the first dimension direction and the second dimension direction is different. The image resolution adjustment method according to claim 25, wherein the image block has different resolutions in the source image. The image resolution adjustment method according to claim 25, wherein the image block corresponds to a center position of the source image, and has the above-mentioned scaling ratio of symmetry. The image resolution adjustment method of claim 25, wherein when the image block is located in an edge region of the source image, one of the image blocks corresponds to a magnification ratio. The image resolution adjustment method according to claim 25, wherein the zoom control device is further configured to: according to the position of the image block in the source image and the display resolution and the original resolution And determining the scaling ratio of each of the image blocks according to a first zoom mode, a second zoom mode, or a third zoom mode. The image resolution adjustment method according to claim 30, wherein the difference between the display resolution and the original resolution is less than or equal to 2 times the original resolution, and the display resolution and the original resolution are When the ratio is a non-integer ratio, the scaling control means determines the scaling ratio of each of the image blocks according to the first scaling mode. The image resolution adjustment method according to claim 31, wherein the image size corresponding to the image block located in the middle region is three times, and the image block located in the edge region corresponds to the image region. The magnification ratio is 1 time. The image resolution adjustment method according to claim 30, wherein the ratio of the original resolution, the display resolution, and the original resolution is greater than a difference between the display resolution and the original resolution When the non-integer ratio is seven times the original resolution of the display resolution greater than two times, the scaling control means determines the scaling ratio of each of the image blocks based on the second scaling mode. The image resolution adjustment method according to claim 33, wherein the enlargement ratio corresponding to the intermediate region to the edge region of the image block is sequentially a predetermined multiple, two times, and one time, and the above The established multiple is greater than or equal to 3 times. The image resolution adjustment method according to claim 30, wherein the original resolution, the display resolution, and the original resolution are greater than 2 times the difference between the display resolution and the original resolution When the ratio is a non-integer ratio and seven times the original resolution is not more than two times the display resolution, the scaling control means determines the scaling ratio of each of the image blocks based on the third scaling mode. The image resolution adjustment method according to claim 35, wherein the enlargement ratio corresponding to the intermediate region to the edge region of the image block is sequentially a predetermined multiple and twice, and the predetermined multiple is greater than Or equal to 3 times.